The first episode of Season 4 of Hawaii Five-O, titled Aloha ke kahi I ke kahi, will see Steve McGarrett and WoFat make a narrow escape from maximum security prison, and McGarrett will also break the law, so he can find his kidnapped girlfriend Catherine Rollins (Michelle Borth), Broadway World revealed.

Kono Kalakaua and Adam Noshimuri's secret location in Hong Kong will also be compromised as gunmen storm the headquarters of Five-O.

In the finale of season 3, McGarrett (Alex 'O Loughlin) visiting WoFat (Kigh Diegh) in maximum security prison and soon discovering that WoFat was planning on using him as a human shield against enemies within the prison, who were trying to break into his cell. Kono (Grace Park) was trying to clear her name from being implicated in a Yakuza-orchestrated murder. She left for Shanghai with with Adam and Doris McGarrett, Steve's mother after being framed for the murder.

The latest promo teaser for Season 4 of Hawaii Five-O shines the spotlight on Chi McBride, who joins the cast this season. McBride (Pushing Daisies) plays the role of SWAT Captain Lou Grover, a character who appeared on the original 1970s program. It was previously reported that McBride was only scheduled to appear in the first episode of the new season, but judging by the teaser it seems like his character will play a very substantial role on the show.

Season 4 will include a number of guest stars, such as Melanie Griffith and Nick Jonas. Griffith will be playing the role of Detective Danny "Danno" Williams' (Scott Caan) mother. Other guest stars include Rumer Willis, Terry O'Quinn, Carol Burnett, Jorge Garcia, Henry Ian Cusick and Rebecca DeMornay.